// names3.c -- use pointers and malloc()
#include <stdio.h>
#include <string.h>  // for strcpy(), strlen()
#include <stdlib.h>  // for malloc(), free()

#define SLEN 81
struct namect {
	char * fname;	// using pointers
	char * lname;
	int letters;
};

void getinfo(struct namect *);			// allocates memory
void makeinfo(struct namect *);
void showinfo(const struct namect *);
void cleanup(struct namect *);			// free memory when done
char * s_gets(char * st, int n);
int main(void)
{
	struct namect person;

	getinfo(&person);
	makeinfo(&person);
	showinfo(&person);
	cleanup(&person);

	return 0;
}

void getinfo(struct namect * pst)
{
	char temp[SLEN];
	printf("Please enter your first name.\n");
	s_gets(temp, SLEN);
	// allocate memory to hold name
	pst->fname = (char *)malloc(strlen(temp) + 1);
	// copy name to allocated memory
	strcpy(pst->fname, temp);
	printf("Please enter your last name.\n");
	s_gets(temp, SLEN);
	pst->lname = (char *)malloc(strlen(temp) + 1);
	strcpy(pst->lname, temp);
}

void makeinfo(struct namect * pst)
{
	pst->letters = strlen(pst->fname) +
		strlen(pst->lname);
}

void showinfo(const struct namect * pst)
{
	printf("%s %s, your name contains %d letters.\n",
		pst->fname, pst->lname, pst->letters);
}

void cleanup(struct namect * pst)
{
	free(pst->fname);
	free(pst->lname);
}

char * s_gets(char * st, int n)
{
	char * ret_val;
	char * find;

	ret_val = fgets(st, n, stdin);
	if (ret_val)
	{
		find = strchr(st, '\n');	// look for newline
		if (find)					// if the address is not NULL,
			*find = '\0';			// place a null character there
		else
			while (getchar() != '\n')
				continue;			// dispose of rest of line
	}
	return ret_val;
}